CN106854347A - A kind of polymeric lactic acid compound film material and preparation method thereof - Google Patents
A kind of polymeric lactic acid compound film material and preparation method thereof Download PDFInfo
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- CN106854347A CN106854347A CN201611092689.0A CN201611092689A CN106854347A CN 106854347 A CN106854347 A CN 106854347A CN 201611092689 A CN201611092689 A CN 201611092689A CN 106854347 A CN106854347 A CN 106854347A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
Abstract
The invention provides a kind of polymeric lactic acid compound film material and preparation method thereof, the preparation method is with PLA, three-element copolymerized ester and organo montmorillonite as raw material, three-element copolymerized ester is by terephthalic acid (TPA), adipic acid and 1,4 butanediol copolymerization are obtained, and are 70 according to the quality parts ratio of PLA, three-element copolymerized ester and organo montmorillonite:30:The ratio of X, wherein X are 1,3,5,7 or 9, are mixed to get ternary blends, control reaction condition, and melting extrusion, granulation, melting extrusion and calendering process are carried out successively to ternary blends, obtain the polymeric lactic acid compound film material that thickness is 0.3 0.7mm.The present invention uses organo montmorillonite as bulking agent, effectively increases the compatibility of polylactic acid blend system.The present invention carries out calendering process using the high shear forces for rolling field offer to melt extrusion simultaneously, the elongation at break of obtained polymeric lactic acid compound film material is 169 294%, tensile strength is 42.2 49.0MPa, with good toughness and ductility, can meet most of construction demand.
Description
Technical field
The present invention relates to Material Field, more particularly to a kind of polymeric lactic acid compound film material and a kind of polymeric lactic acid compound film material
Preparation method.
Background technology
PLA (polylactic acid, PLA) is a kind of biodegradable polymers, due to high intensity and thoroughly
Bright property feature, therefore there is preferable application prospect in packing film field.But the fragility of PLA limits its application.
Add a kind of effective ways that elastomer or flexible resin are toughness reinforcing PLA.PBAT (polyadipates/terephthalic acid (TPA)
Fourth diester, Poly (butyleneadipate-co-tere phthalate)) be it is a kind of obtain in recent years commercialization promote it is new
The biodegradable three-element copolymerized ester of type, is mainly formed, by terephthalic acid (TPA), adipic acid and BDO copolymerization because PBAT is big
Both there is preferably elasticity and extended containing flexible aliphatic chain and rigid aromatic group, thus PBAT simultaneously in strand
Property, it may have preferable heat resistance.PBAT good toughness, can use as the toughener of PLA, thus by academia and industrial quarters
Extensive concern.
In order to improve the compatibility of polylactic acid blend system, it is common practice to introduce Macromolecular Compatibilizer, such as introduce
Polycthylene grafted GMA-co-St (PE-g- (GMA-co-St)), ethylene-vinyl acetate etc..But due to above-mentioned macromolecular phase
The main chain for holding agent is lipophile structure, and the presence of lipophile structure limits the increase-volume of PLA, therefore Macromolecular Compatibilizer is played
Compatibilization effect it is not good.It can in addition contain pass through the compatibilization effect of the method raising PLA for introducing response type compatilizer, for example, introduce
Isocyanates, ethene and glycidyl methacrylate copolymer, styrene and glycidyl methacrylate copolymer,
Although such reactive compatibilizer can play preferable compatibilization effect, the addition of reactive compatibilizer can cause PLA
Chain extension even cross-linking reaction, causes the mobile performance of melt to be greatly lowered so that the filming performance deterioration of polydactyl acid, or even
Cannot be molded, disadvantages mentioned above limits the use of reactive compatibilizer.
Therefore, a kind of preferable high tenacity PLA compound film materials of compatibility are badly in need of at present, and one kind prepares the high tenacity
The method of PLA compound film materials.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of polymeric lactic acid compound film material and a kind of polymeric lactic acid compound film
The preparation method of material, above-mentioned technical problem is solved with all or part of.
According to one aspect of the present invention, there is provided a kind of preparation method of polymeric lactic acid compound film material, methods described includes：
PLA and three-element copolymerized ester are put into vacuum drying oven, 10-12h is dried at 50-80 DEG C, by organo montmorillonite
Be put into air dry oven, 6-8h dried at 110-130 DEG C, the three-element copolymerized ester by terephthalic acid (TPA), adipic acid and 1,
4- butanediol copolymerization is obtained；
PLA and three-element copolymerized ester after combination drying, it is dry to being added in well mixed PLA and three-element copolymerized ester
Organo montmorillonite after dry, obtains ternary blends, in the ternary blends, the PLA, the three-element copolymerized ester
It is 70 with the quality parts ratio of the organo montmorillonite:30:X, wherein, the X is 1,3,5,7 or 9；
Melting extrusion treatment is carried out to the ternary blends using double screw extruder, melt extrudate is made through pelleter
Grain, obtains blend section, and between 170-190 DEG C, screw speed control exists the temperature control in the double screw extruder
50-150rad·min-1, the rotating speed control of the pelleter is in 25-100radmin-1；
Under the conditions of identical melting extrusion, the blend is cut into slices using the double screw extruder it is crowded to carry out melting
Go out treatment, obtain melt extrusion, calendering process is carried out to the melt extrusion using two roll calender, obtain thickness for 0.3-
The polymeric lactic acid compound film material of 0.7mm.
Alternatively, the organo montmorillonite is obtained by double hydrogenated tallow dimethyl ammoniums and silicone-modified montmorillonite.
Alternatively, the three-element copolymerized ester dispersed phase of the polymeric lactic acid compound film material has stratiform and filamentary structure.
Alternatively, the elongation at break of obtained polymeric lactic acid compound film material is 169-294%, and tensile strength is 42.2-
49.0MPa。
Alternatively, when the X is 3, the elongation at break of the polymeric lactic acid compound film material of gained is 294%, tensile strength
It is 47.2MPa.
According to another aspect of the present invention, there is provided a kind of polymeric lactic acid compound film material prepared according to the above method, institute
PLA, three-element copolymerized ester and organo montmorillonite of the polymeric lactic acid compound film material by being well mixed is stated to sequentially pass through melting extrusion, make
Grain, melting extrusion and calendering process are obtained；
The three-element copolymerized ester is obtained by terephthalic acid (TPA), adipic acid and 1,4- butanediol copolymerization；
The quality parts ratio of the PLA, the three-element copolymerized ester and the organo montmorillonite is 70:30:X, wherein,
The X is 1,3,5,7 or 9；
The three-element copolymerized ester dispersed phase of the polymeric lactic acid compound film material has stratiform and filamentary structure, and the PLA is answered
The thickness for closing membrane material is 0.3-0.7mm；
The elongation at break of the polymeric lactic acid compound film material is 169-294%, and tensile strength is 42.2-49.0MPa.
Alternatively, when X is 3, the elongation at break of the polymeric lactic acid compound film material of gained is 294%, and tensile strength is
47.2MPa。
Alternatively, the organo montmorillonite is obtained by double hydrogenated tallow dimethyl ammoniums and silicone-modified montmorillonite.
Compared with prior art, the present invention includes advantages below：
The invention provides a kind of preparation method of polymeric lactic acid compound film material, with PLA, three-element copolymerized ester and organic illiteracy
De- soil is raw material, and three-element copolymerized ester is obtained by terephthalic acid (TPA), adipic acid and BDO copolymerization, according to PLA, ternary
The quality parts ratio of copolyesters and organo montmorillonite is 70:30:The ratio of X, wherein X are 1,3,5,7 or 9, are mixed to get ternary
Blend, controls processing conditions, and melting extrusion, granulation, melting extrusion and calendering process are carried out successively to ternary blends, obtains
It is the polymeric lactic acid compound film material of 0.3-0.7mm to thickness.
The present invention uses organo montmorillonite as bulking agent, effectively increases the compatibility of polylactic acid blend system.Simultaneously
The present invention carries out calendering process using the high shear forces for rolling field offer to melt extrusion, and test result shows, at calendering
The polymeric lactic acid compound film material that reason is obtained has preferable toughness.In addition the three-element copolymerized ester dispersed phase of polymeric lactic acid compound film material obtained by
With stratiform and filamentary structure, so as to further increase the toughness of polymeric lactic acid compound film material.According to the pressure that the present invention is provided
Prolong the elongation at break of polymeric lactic acid compound film material obtained in method for 169-294%, tensile strength is 42.2-49.0MPa, is had
Good toughness and ductility, can meet most of construction demand.
Brief description of the drawings
Fig. 1 is a kind of flow chart of the preparation method of polymeric lactic acid compound film material described in the embodiment of the present invention；
Fig. 2 a are the SEM scanning electron microscope (SEM) photographs of the condensate of melt extrusion when embodiment of the present invention X is 0；
Fig. 2 b are the SEM scanning electron microscope (SEM) photographs of the condensate of melt extrusion when embodiment of the present invention X is 1；
Fig. 2 c are the SEM scanning electron microscope (SEM) photographs of the condensate of melt extrusion when embodiment of the present invention X is 3；
Fig. 2 d are the SEM scanning electron microscope (SEM) photographs of the condensate of melt extrusion when embodiment of the present invention X is 5；
Fig. 2 e are the SEM scanning electron microscope (SEM) photographs of the condensate of melt extrusion when embodiment of the present invention X is 7；
Fig. 3 a are the SEM scanning electron microscope (SEM) photographs of the section of polymeric lactic acid compound film material when embodiment of the present invention X is 0；
Fig. 3 b are the SEM scanning electron microscope (SEM) photographs of the section of polymeric lactic acid compound film material when embodiment of the present invention X is 1；
Fig. 3 c are the SEM scanning electron microscope (SEM) photographs of the section of polymeric lactic acid compound film material when embodiment of the present invention X is 3；
Fig. 3 d are the SEM scanning electron microscope (SEM) photographs of the section of polymeric lactic acid compound film material when embodiment of the present invention X is 5；
Fig. 3 e are the SEM scanning electron microscope (SEM) photographs of the section of polymeric lactic acid compound film material when embodiment of the present invention X is 7.
Specific embodiment
It is below in conjunction with the accompanying drawings and specific real to enable the above objects, features and advantages of the present invention more obvious understandable
The present invention is further detailed explanation to apply mode.
Flow is described in detail to be realized to the method for the invention below by embodiment.
The invention provides a kind of preparation method of polymeric lactic acid compound film material.Fig. 1 is a kind of poly- described in the embodiment of the present invention
The flow chart of the preparation method of lactic acid compound film material.Reference picture 1, the preparation method may comprise steps of：
Step 101, raw material PLA and three-element copolymerized ester are put into vacuum drying oven, 10-12h are dried at 50-80 DEG C,
Organo montmorillonite is put into air dry oven, 6-8h is dried at 110-130 DEG C.
Present invention selection PLA (PLA, polylactic acid), three-element copolymerized ester and organo montmorillonite (OMMT,
Organic montmorillo nite) prepare polymeric lactic acid compound film material as raw material.
Wherein, three-element copolymerized ester is obtained by terephthalic acid (TPA), adipic acid and BDO copolymerization, and Chinese is to gather oneself
Diacid/butylene terephthalate, English name is Poly (butyleneadipate-co-tere phthalate, English name
Title is abbreviated as PBAT.
The OMMT for using is obtained by organic modifiers modified montmorillonoid, and organic modifiers are preferably double hydrogenated tallow dimethyl
Ammonium and siloxanes, while using above two organic modifiers modified montmorillonoid.
PLA and three-element copolymerized ester after step 102, combination drying, to well mixed PLA and three-element copolymerized ester
The middle dried organo montmorillonite of addition, obtains ternary blends.
In ternary blends, the quality parts ratio of PLA, PBAT and OMMT is 70:30:X, wherein, X be 1,3,5,7 or
9.That is, according to tri- kinds of raw materials of aforementioned proportion mixing PLA, PBAT and OMMT.
Step 103, melting extrusion treatment is carried out to ternary blends using double screw extruder, melt extrudate is through pelletizing
Machine is granulated, and obtains blend section.
During melting extrusion treatment is carried out to ternary blends using double screw extruder, in double screw extruder
Temperature control between 170-190 DEG C, will temperature control of the double screw extruder from an area to discharging opening at 170-190 DEG C
Between；Screw speed is controlled in 50-150radmin-1, the rotating speed control of pelleter is in 25-100radmin-1。
Step 104, under the conditions of identical melting extrusion, using double screw extruder to blend cut into slices carry out melting squeeze
Go out treatment, obtain melt extrusion, calendering process is carried out to melt extrusion using two roll calender, obtain thickness for 0.3-0.7mm
Polymeric lactic acid compound film material.
To make the mixing of PLA, three-element copolymerized ester and organo montmorillonite more uniform, the present invention is obtaining blend section
Afterwards, under the conditions of identical melting extrusion, i.e., under the conditions of melting extrusion in step 103, using double screw extruder to altogether
Mixed thing section carries out melting extrusion treatment, obtains mixing more uniform melt extrusion.
In order to improve the toughness of material, the present invention carries out calendering process to melt extrusion, and the height provided by rolling field is cut
The effect of cutting so that the PBAT dispersed phases of the polymeric lactic acid compound film material after calendering process have threadiness or layer structure, above-mentioned knot
The presence of structure imparts polymeric lactic acid compound film material toughness and ductility higher.
Present invention also offers a kind of polymeric lactic acid compound film material, the polymeric lactic acid compound film material is provided according to the present invention
Prepared by a kind of preparation method of polymeric lactic acid compound film material.
The polymeric lactic acid compound film material for preparing sequentially passes through melting extrusion, granulation, melts and squeeze by PLA, PBAT and OMMT
Go out and calendering process is obtained, the quality parts ratio of PLA, PBAT and OMMT is 70:30:X, wherein X are 1,3,5,7 or 9, gained
Polymeric lactic acid compound film material thickness be 0.5mm.
The present invention is 0 to X, 1,3,5,7,9 six kind of polymeric lactic acid compound film material has carried out tensile strength and elongation at break is surveyed
Examination.
Experimental raw：PLA (PLA), 4032D, Nature Works companies；Polyadipate/butylene terephthalate
(PBAT), C1200, BASF AG；Organo montmorillonite (OMMT), I.44PSS, the modifying agent of modified montmorillonoid is：Double hydrogenation oxen
Fat Dimethyl Ammonium and siloxanes, NANOCOR companies of the U.S..Test result is as shown in table 1.
The tensile property of the polymeric lactic acid compound film material of the difference OMMT contents of table 1
| Proportioning (mass fraction/mass fraction) | Tensile strength (MPa) | Elongation at break (%) |
| PLA/PBAT(70/30) | 53.8 | 42 |
| PLA/PBAT/OMMT(70/30/1) | 49.0 | 169 |
| PLA/PBAT/OMMT(70/30/3) | 47.2 | 294 |
| PLA/PBAT/OMMT(70/30/5) | 46.6 | 294 |
| PLA/LLDPE/PBAT(70/30/7) | 45.3 | 239 |
| PLA/LLDPE/PBAT(70/30/9) | 42.2 | 187 |
From data in table 1, the addition of OMMT significantly improves the elongation at break of polymeric lactic acid compound film material.For not
Binary polymeric lactic acid compound film material containing OMMT, its elongation at break is only 42%, after OMMT is added, although ternary PLA is answered
The tensile strength for closing membrane material slightly declines, but elongation at break is greatly improved.When OMMT mass fraction for 3 parts and
At 5 parts, the elongation at break of ternary polymeric lactic acid compound film material reaches maximum 294%.When the mass fraction of OMMT is 9 parts,
The toughness of ternary polymeric lactic acid compound film material has declined, but its elongation at break remains at 187%, compound compared to binary
The 42% of material, still with preferable toughness.
By above-mentioned data, when OMMT addition within the specific limits when, the addition of OMMT can improve poly- breast
The toughness of sour compound film material.The raising of polymeric lactic acid compound film material toughness can be solved by the change of material microstructure
Release.
Fig. 2 a- Fig. 2 e are the SEM scanning electron microscope (SEM) photographs of the condensate of the melt extrusion of embodiment of the present invention difference OMMT contents.
In the corresponding melt extrusion of condensate shown in Fig. 2 a- Fig. 2 e, the quality parts ratio of PLA, PBAT and OMMT is 70:30:X, X are
0th, 1,3,5 or 7.Understood based on above-mentioned preparation method, melt extrusion is raw material by melting extrusion, pelleter granulation and again
Melting extrusion treatment is obtained, and is the intermediate product of polymeric lactic acid compound film material.
Reference picture 2a- Fig. 2 e understand, when not adding OMMT, the condensate of the binary melt extrusion being made up of PLA and PBAT
In, dispersed phase PBAT is dispersed in PLA matrixes with spheric granules, forms so-called " island " shape structure, and dispersed phase size is larger,
Two-phase interface is clear, illustrates that both compatibilities are not good.And when OMMT contents gradually increase, it is obvious that with do not add
The condensate of the binary melt extrusion of OMMT is compared, and is added the two-phase interface of the condensate of the ternary melt extrusion of OMMT and is become mould
Paste, while dispersed phase particle size is reduced significantly, has reached good increase-volume thinning effect.
The addition of OMMT causes PBAT dispersed phase sizes significantly to refine, and can be attributed to OMMT nanoscale twins in dispersion phase boundary
Selective distribution in face, greatly reduces the surface tension of dispersed phase interface so that dispersed phase size is remarkably decreased.
Fig. 3 a- Fig. 3 e are the SEM scanning electron microscope (SEM) photographs of the polymeric lactic acid compound film material of embodiment of the present invention difference OMMT contents.Figure
Polymeric lactic acid compound film material in 3a- Fig. 3 e is that the corresponding melt extrusion of condensate in Fig. 2 a- Fig. 2 e is obtained by calendering process
's.
It is the island shape dispersed structure of the condensate of the melt extrusion of PLA/PBAT/OMMT (70/30/0) compared to proportioning
(shown in reference picture 2a), is the polymeric lactic acid compound film material of PLA/LLDPE/OMMT (70/30/0) by the proportioning of calendering process
PBAT dispersed phases are changed into stratiform and fibrous orientation form (shown in reference picture 3a), and this is because PBAT dispersion particles are in warp
Caused by being caused by the strong extruding rolled and shear action significantly deformation when crossing double roller gap.
With the increase of OMMT contents, the stratiform of polymeric lactic acid compound film material and fibrous orientation texture quantity significantly increase,
And size is greatly reduced.Theoretical according to crazing-shear yielding, under conditions of content of dispersed phase is constant, dispersed phase size is smaller,
Its dispersed phase number is more, and the crazing that its induction is produced is more with shear band.Meanwhile, with the extension of crazing, disperse the number of phases
Purpose increase crazing collided and terminated crazing probability it is also bigger.With the increase of strain, crazing is constantly produced, sent out
Exhibition and termination, can occur plastic deformation and absorb more energy when causing material stress.In addition dispersed phase be generally sheet and
Threadiness, further increases the probability of crazing termination, so that membrane material toughness obtains larger raising.
From the above results, when OMMT additions are 3 parts and 5 parts, the toughness and ductility of polymeric lactic acid compound film material
It is best.With the further increase of OMMT additions, its toughness decreases, and this is probably because part OMMT particles are in poly- breast
Reunite in acidic group body, caused by formation defect point.
The invention provides a kind of preparation method of polymeric lactic acid compound film material, with PLA, three-element copolymerized ester and organic illiteracy
De- soil is raw material, and three-element copolymerized ester is obtained by terephthalic acid (TPA), adipic acid and BDO copolymerization, according to PLA, ternary
The quality parts ratio of copolyesters and organo montmorillonite is 70:30:The ratio of X, wherein X are 1,3,5,7 or 9, are mixed to get ternary
Blend, controls processing conditions, and melting extrusion, granulation, melting extrusion and calendering process are carried out successively to ternary blends, obtains
It is the polymeric lactic acid compound film material of 0.3-0.7mm to thickness.
The present invention uses organo montmorillonite as bulking agent, effectively increases the compatibility of polylactic acid blend system.Simultaneously
The present invention carries out calendering process using the high shear forces for rolling field offer to melt extrusion, and test result shows, at calendering
The polymeric lactic acid compound film material that reason is obtained has preferable toughness.In addition the three-element copolymerized ester dispersed phase of polymeric lactic acid compound film material obtained by
With stratiform and filamentary structure, so as to further increase the toughness of polymeric lactic acid compound film material.According to the pressure that the present invention is provided
Prolong the elongation at break of polymeric lactic acid compound film material obtained in method for 169-294%, tensile strength is 42.2-49.0MPa, is had
Good toughness and ductility, can meet most of construction demand.
Above to a kind of polymeric lactic acid compound film material provided by the present invention and a kind of preparation side of polymeric lactic acid compound film material
Method is described in detail, and specific case used herein is set forth to principle of the invention and implementation method, the above
The explanation of embodiment is only intended to help and understands the method for the present invention and its core concept；Simultaneously for the general skill of this area
Art personnel, according to thought of the invention, will change in specific embodiments and applications, in sum, this
Description should not be construed as limiting the invention.
Claims (8)
1. a kind of preparation method of polymeric lactic acid compound film material, it is characterised in that methods described includes：
PLA and three-element copolymerized ester are put into vacuum drying oven, 10-12h is dried at 50-80 DEG C, organo montmorillonite is put into
In air dry oven, 6-8h is dried at 110-130 DEG C, the three-element copolymerized ester is by terephthalic acid (TPA), adipic acid and Isosorbide-5-Nitrae-fourth
Glycol copolymerization is obtained；
PLA and three-element copolymerized ester after combination drying, after addition is dried in well mixed PLA and three-element copolymerized ester
Organo montmorillonite, obtain ternary blends, in the ternary blends, the PLA, the three-element copolymerized ester and institute
The quality parts ratio for stating organo montmorillonite is 70:30:X, wherein, the X is 1,3,5,7 or 9；
The ternary blends are carried out with melting extrusion treatment using double screw extruder, melt extrudate is granulated through pelleter,
Blend section is obtained, between 170-190 DEG C, screw speed is controlled in 50- the temperature control in the double screw extruder
150rad·min-1, the rotating speed control of the pelleter is in 25-100radmin-1；
Under the conditions of identical melting extrusion, the blend is cut into slices using the double screw extruder carried out at melting extrusion
Reason, obtains melt extrusion, and calendering process is carried out to the melt extrusion using two roll calender, obtains thickness for 0.3-0.7mm
Polymeric lactic acid compound film material.
2. preparation method according to claim 1, it is characterised in that the organo montmorillonite is by double hydrogenated tallow dimethyl
Ammonium and silicone-modified montmorillonite are obtained.
3. preparation method according to claim 1, it is characterised in that the three-element copolymerized ester of the polymeric lactic acid compound film material point
Dephasing has stratiform and filamentary structure.
4. preparation method according to claim 1, it is characterised in that the elongation at break of obtained polymeric lactic acid compound film material
It is 169-294%, tensile strength is 42.2-49.0MPa.
5. preparation method according to claim 4, it is characterised in that when the X is 3, the polymeric lactic acid compound film of gained
The elongation at break of material is 294%, and tensile strength is 47.2MPa.
6. a kind of polymeric lactic acid compound film material prepared according to claim any one of 1-5 methods described, it is characterised in that described poly-
Lactic acid compound film material sequentially passes through melting extrusion, granulation, melts by the PLA, three-element copolymerized ester and the organo montmorillonite that are well mixed
Melt extrusion and calendering process is obtained；
The three-element copolymerized ester is obtained by terephthalic acid (TPA), adipic acid and 1,4- butanediol copolymerization；
The quality parts ratio of the PLA, the three-element copolymerized ester and the organo montmorillonite is 70:30:X, wherein, the X
It is 1,3,5,7 or 9；
The three-element copolymerized ester dispersed phase of the polymeric lactic acid compound film material has stratiform and filamentary structure, the polymeric lactic acid compound film
The thickness of material is 0.3-0.7mm；
The elongation at break of the polymeric lactic acid compound film material is 169-294%, and tensile strength is 42.2-49.0MPa.
7. polymeric lactic acid compound film material according to claim 6, it is characterised in that when X is 3, the PLA of gained is combined
The elongation at break of membrane material is 294%, and tensile strength is 47.2MPa.
8. polymeric lactic acid compound film material according to claim 6, it is characterised in that the organo montmorillonite is by double hydrogenated tallows
Dimethyl Ammonium and silicone-modified montmorillonite are obtained.
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